Thank you very much guys, very helpful.
Just to clarify, I tried the micro vacum and compressed air and that did not work. There is hair and dirt still sticking, I bought this used, amp is around 6 years old so not ancient but used by some dirty bunch I believe.
I can get the grime off with slight damp cloth, and cleaned out what I could and let it there overnight and turned it on and used, perfect but I was trying to get the rest of the dirt off, I believe a small brush with the Chemtronis might work if done with care.
Well I rather leave it the way it is and use but its eating me, I am anal about my gear and I rather clean it up to make sure its well, thanks again guys
rapogee